Tools and test
Probes, testers and meters for the bench.
4 builds
VideoIs that pin high or low? Two transistors tell you
Touch the probe to a 5V logic signal: red means high, green means low, nothing means it's floating. Two transistors, no chip.
10 parts · 6 wires
Tools and test
VideoThis LED tells you how dead your battery is
A light for a 12V lead acid battery: green when it's healthy, yellow when it's getting low, red when it's nearly flat.
13 parts · 17 wires
PowerTools and test
Premieres Oct 31How bright is it in here, in four LEDs
Four LEDs that light one after another as a room gets brighter. A photoresistor and one quad op amp chip, no code.
18 parts · 21 wires
SensorsTools and test
Premieres Nov 10The tool every electronics bench has, from one chip
Touch two probes across anything that conducts and it beeps. A bench continuity tester from one 555 timer and a piezo.
10 parts · 14 wires
Tools and test
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